Teardown after crash - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-15-2019, 01:17 PM   #1
Dyngwal
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Teardown after crash


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So, was out flying this morning, and on a fresh set of batteries, my Spektrum DX6 3G went to low battery warning. This is how I found out that the low battery warning doesn't mean "you should probably land this now", it means "nah, I'm not actually going to control this plane anymore". Looking for a guide on how to teardown and inspect the motor. Failsafe worked, so it went in at idle/with the carb closed. The motor is an OS 55 AX, less than 2 hours on it. The only other time I had a lawn dart the owner of the LHS took a look at it for me, but I'd like to take this on myself, if nothing else to be able to say in the classified ad that it was crashed, but inspected and came back clean.
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Old 09-15-2019, 01:42 PM   #2
michaely
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Re: Teardown after crash

Two stroke engines are pretty sturdy and any crash damage is typically visible without dismantling the engine, such as broken carb or muffler mounting.

Getting grit into the engine thru the carb is a more likely problem but in your case the carb was closed at impact. Without turning over the prop, I would remove the carb and flush it with fuel/methanol, etc. to ensure that any grit on top of carb barrel doesn't get further into the engine.

While I have seen engine for sale ads that note specific defects, typically shot bearings, etc., I can't recall any ads for engines talking about the engine being in a crash. Planes, yes, along with any repairs made or needed.
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Old 09-15-2019, 02:56 PM   #3
floyd
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Re: Teardown after crash

As said above 2-Strokes are tough engines. If you broke the prop on impact you should check that the threaded part of the Crank shaft didn't get bent. Not so much if you had a spinner on it. It's also easy to remove the back plate to flush the engine out. Cheers Floyd
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Old 09-15-2019, 08:52 PM   #4
Dyngwal
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Re: Teardown after crash

I had a spinner on it so hopefully that gave a bit of relief. Will take a look at it this winter, sucks to end the season this way (probably the last decent day in Winnipeg we were going to get). Thanks for the advice.
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Old 09-17-2019, 05:10 PM   #5
cf100
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Re: Teardown after crash

Quote:
Originally Posted by Dyngwal View Post
I had a spinner on it so hopefully that gave a bit of relief. Will take a look at it this winter, sucks to end the season this way (probably the last decent day in Winnipeg we were going to get). Thanks for the advice.
I've had many glow engines crash, some went in vertical and were buried 6" deep in the tundra.

Good advice above, don't dissemble, clean up the engine, oil it up and use it again.
Cheers. Ken
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Old 09-17-2019, 05:30 PM   #6
HAL9KPCM
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Re: Teardown after crash

I piled in one of my planes like a fence post full speed last summer. Pretty much nothing left of the plane and destroyed all 4 servos and battery pack. The engine went right back on to the new plane after flushing it clean with some methanol.
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Old 09-22-2019, 12:12 PM   #7
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Re: Teardown after crash

Anytime you crash and the engine has some dirt around front end .I would recommend take the carb, back plate ,muffler and the head off. Flush with fuel or methanol and check for free movement of carb barrel also piston and crank. Make sure no debris is in the cylinder or exhaust port. Reassemble and check run-out in prop shaft. Go play.
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